No. If your sister/brother have the deed and the house has been signed over to them then it's theres. If your mother is still living and of sound mind, there is a possibility of her changing that (dependening on the circumstances.) If your mother has passed on then you can "contest the will" and this means you feel things are unfair. You have a right to see the Will and perhaps your mother has requested that the house/property have been sold and divided equally amongst her children. Often siblings can take full advantage of the elderly parents and it's called greed. Some siblings will take over as Power of Attorney to protect their elderly parent(s). This gives you the right to pay their bills, watch over medical expenses, etc., but as far as the Will the laws basically stop there as Power of Attorney. I suggest you get legal counsel on this problem and get to know your rights.
brother
Yes. However, an attorney must be consulted in order to get the child's custody to be legally under the child's two mothers. Without consulting an attorney, the child will belong to the mother who birthed the child and the brother who provided the sperm.
In Farsi, you would say "amoo" for mother's brother.
If the father refuses, a default order can be entered against him. Mothers use the right of privacy to prevent the test see links below
uncle
Your Uncle.
Your mother's son is your brother or your half brother.
A cousin brother means , the son of the father or mothers , brother or sister.
papu
That would be an uncle.
mamo
your uncle